| Issue | #23 |
| Published | July-August 1973 |
| Frequency | bi-monthly |
| Cover Price | 0.20 USD |
| Pages | 36 |
| Editing | Julius Schwartz |
| Genre | science fiction |
| Pencils | Nick Cardy |
| Inks | Nick Cardy |
| Notes | Credits for pencils and inks confirmed from Julius Schwartz's editorial records, provided by DC Comics. [August 2007] |
| Genre | science fiction |
| Script | Otto Binder |
| Pencils | Carmine Infantino |
| Inks | Joe Giella |
| Notes | Credits for script, pencils and inks confirmed from Julius Schwartz's editorial records, provided by DC Comics (April 2007). |
| Reprinted | from Strange Adventures (DC, 1950 series) #75 (December 1956) |
| Genre | science fiction |
| Script | Gardner Fox |
| Pencils | Sid Greene |
| Inks | Sid Greene |
| Notes | Credits for script, pencils and inks confirmed from Julius Schwartz's editorial records, provided by DC Comics (April 2007). |
| Reprinted | from Mystery in Space (DC, 1951 series) #67 (May 1961) |
| Genre | science fiction |
| Script | Gardner Fox |
| Pencils | Mike Sekowsky |
| Inks | Bernard Sachs |
| Notes | 1st story in series which would become "Space Museum". Credits for script, pencils and inks confirmed from Julius Schwartz's editorial records, provided by DC Comics (April 2007). |
| Reprinted | from Strange Adventures (DC, 1950 series) #104 (May 1959) |
| Script | Julius Schwartz [as JS] |
| Letters | Typeset |
| Notes | Letters of comment from readers Bob Rozakis, Gerard Triano, Greg Coben, with replies from Schwartz. |